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Showing results for tags 'crystal replacement'.
Found 3 results
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Understanding old crystal size measurements
agregate posted a question in Watch Repairs Help & Advice
This question isn't really one of repair but more a direct question as to what the markings are on the little stickers you find on old watch and pocket watch crystals. I understand the 1/16 measurements are lignes, the 1/4 measurements are lunettes(?), the three digit numbers are tenths of milimeters and the number typically from 1-5 is the height of a Geneva crystal, but what do the numbers measured in fractions of 1/8 signify? I did a calculation and the conversion from mystery unit to lignes is lignes = (1/2) x mystery + 10 Any ideas? -
All, Hope everyone is staying safe and well. I have two new "project" watches that have a common issue. I suppose very simple and straight forward, but that's if you have the experience. The two watches have square/rectangular crystals that need to be replaced or affixed. The first is the easiest. So, I'll start with that. It's a vintage ladies Girard-Perregaux tank. With a square crystal. The crystal is in good condition, but loose. The crystal is acrylic - and I believe the proper way for this to be fixed to the case is using something like GS crystal cement. But w
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Finished Valjoux 7750...scared to change crystal!
noirrac1j posted a question in Watch Repairs Help & Advice
Hello, I just finished this Lorenz chronograph with a 17 jewel ETA 7750 powering it. I had some rough patches when I lost the chronograph wheel friction setting and the hour lock. I ordered new ones and things went OK until I misplaced the hour counter wheel and had to go back in. After that I adjusted all the settings, which took removing the chrono wheel, hour counter, and minute counter hands twice to get them perfectly centered and resetting properly. Now I look at the crystal and my confidence wavers because I've never changed a glass crystal and this one is curved. I have all the to
